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21597 (1998 WA8)
Classification: Main-belt Asteroid          SPK-ID: 2021597
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07194571304950129 5.9376e-08  
a 3.023306125546982 3.0005e-08 au
q 2.80579221057758 1.8106e-07 au
i 11.25417338391281 6.2598e-06 deg
node 59.94580791088576 3.7835e-05 deg
peri 231.6789944897988 7.4706e-05 deg
M 255.5297072526869 6.9056e-05 deg
tp 2458157.701046963298
(2018-Feb-08.20104696)
0.00037136 JED
period 1920.090119704834
5.26
2.8584e-05
7.826e-08
d
yr
n .1874911996606394 2.7911e-09 deg/d
Q 3.240820040516385 3.2164e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1063  
   data-arc span      7269 days (19.90 yr)  
   first obs. used      1996-05-16  
   last obs. used      2016-04-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50531  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:37:07  

Additional Information
 Earth MOID = 1.80537 au 
 Jupiter MOID = 1.87633 au 
 T_jup = 3.212 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.3 mag n/a MPO365509  

21597 (1998 WA8)          Discovered 1998-Nov-18 by Ueda, S., Kaneda, H. at Kushiro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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